Double knot netting



June 1955 R. JOHNSON DOUBLE KNOT NETTING 2 Sheets-Sheet 1 Filed Nov. 1,1952 June 21, 1955 Filed Nov. 1, 1952 R. JOHNSON 2,711,116

DOUBLE KNOT NETTING 2 Sheets-Sheet 2 Avvevvran DOUBLE KNOT NETTINGRoland Johnson, Drnmmondviile, Quebec, Canada, assignor to DrummondvilleCotton Company Limited, Montreal, Quebec, Canada, a corporation ofCanada Application November 1, 1952, Serial No. 318,238

Claims. (Cl. 87-53) The present invention relates to the manufacture ofnets and more particularly to the making of a double atent moved by thetwine tube to a diagonal position across the twisted loops to a positionat one side of the hook. The shuttle thread which is located on theshuttle between each pair of creel threads, is then passed by theshuttle up through the twisted loops and while the shuttle is in thetop' position the twine tube carrying the creel thread is moved back tothe original side of the hook. The shuttle is then passed downwardsthrough the loop to its original position beneath the retaining pin andhook. The rotatable hooks are then rotated back to their originalcondition untwisting the loop so that the shuttle thread is now loopedabout one portion of the creel thread and is looped about by two.:full

loops of the creel thread.

Av plurality of restraining pins are mounted on an elongated barextending the length of the operative portion of the loom in spacedapart relationship corresponding to the location of the retaining pinsand hooks to pass through the looped creel threads in a time relatedsequence so that the shuttle threads are each alternatively knotted tothe two creel threads between which each shuttle operates. The creelthreads are fed lengthwise as each knot is formed so that the meshes ofthe net are formed in the usual manner.

The knot uniting the creel threads and shuttle threads may be of asingle or a double type of knot well known in the art as a weavers knot.The double weavers knot possesses certain advantages over the singleknot in that it is more secure and accordingly is less liable toslippage.

The present invention aims to provide an improved method of making adouble weavers knot on a netting loom and apparatus by means of whichthe method may be carried out.

Accordingly, the invention is a method of forming a double weavers knotcomprising the steps of forming a double loop of a first or creel threadand retaining the ends of the loops on spaced apart retaining points,twisting the double loop to form a loop having two bights while movingthe first thread diagonally to one side of one of the retaining pointspassing the second thread through one bight of the'twisted double loop,moving the first thread to the other side of said retaining point,passing the second thread back down through said bight, untwisting theloop, and progressively restraining the loop while drawing up the firstthread and then releasing the loops and tightening the knot. The entiresequence of steps is carried out with both the first thread and secondthread under tension and in multiple fashion so that with each knottingstep a complete row of meshes is added to the net. The knots are madealternatively right and left handed, with respect to the loom onalternate rows so as to prevent twisting of the net strands.

More specifically, a loom by means of which the present method may becarried out is provided with spaced apart rows of retaining pins androtatable hooks arranged in opposed relationship. A double knot is madeon this loom as follows; the creel thread is fed from supply creels inindividual parallel rows to the retaining pins where each strand iswound, by means of a twine tube, in two full loops about a retaining pinand a corresponding hook. The hooks are each then rotated about 180degrees 'to twist the loops over each other while the feeding portion ofthe creel thread is and means provided whereby these restraining pinsare moved forward and downward while the loops are slipped oif the hooksonto the restraining pins. The bar holding the restraining pins is thencaused to move backwards towards the retaining pins while the knotsare-drawn up by tension being applied to the creel thread fed throughthe twine' tubes by a bascule acting on the creel thread between thesupply packages and the twine tubes.

When the loops have been drawn up and the restraining pins have reachedthe retaining pins the bar holding the restraining pins is caused tolift leaving the loops solely on the retaining pins. The entire row ofretaining pins are then withdrawn releasing the finished row of knots.The completed row of mesh is drawn backwards by the usual rollarrangement a predetermined distance so that when the retaining pinsagain come up into position the completed knots are free and theretaining pins are in starting position to receive the double loops fromthe twine tubes and so on.

As will be appreciated, the knots so made are alternated on every row sothat each row of the mesh is united by a left-hand or right-hand knotkeeping the strands from twisting as the weaving proceeds.

' Detailed description Having thus generally described the nature of theinvention particular'reference will be made to the accompanying drawingsshowing by way of illustration 2. single set of the loom elementscapable of making a double knot in accordance with the invention, and inwhich:

Figure 1 is a diagrammatic view showing a portion of a net embodyingdouble weavers knots formed in accordance with the invention.

Figure 2 is an enlarged detail view of a double weavers knot formedaccording to the invention.

Figure 3 is a diagrammatic view partially in section showing thepreferred arrangement of loom elements for making a double weavers knotaccording to the invention.

Figures 4 through 12 illustrate in step by step sequence the presentmethod of forming a double weavers knot on a netting loom.

Figure 13 is an enlarged detail view of the completed knot asit wouldappear when tightened after the finalstep shown in Figure 12.

With particular reference to the drawings, Figure 1 shows a portion of anet wherein the strands are joined by double weavers knots according tothe invention to illustrate in more detail the alternative left andrighthand knot uniting the strands in alternaterows. The knotsAinvthe.first roware right-hand while 'the'knot B in the second row isleft-hand and the knots C in the third row are again right-hand and soon. The enlarged detail of the partially tied knot in Figure 2 shows alefthand knot similar to that indicated at B.

The netting loom by means of which the present method is carried out isof conventional construction with the exception that there is provided amoving bar containing a plurality of spaced apart restraining pins 12, aportion of the bar and one pin only being shown by way of illustration.The present construction also includes retaining pins 14, rotatablehooks 16, reciprocating shuttles 18, and twine tube feeders which areadapted to supply and feed a creel thread D from supply creels 22. Atensioning bascule 24 .is pivotally mounted between the supply creels 22and the twinetubes 20 so as to be adapted to exert tension on the creelthread D to draw up the knots as will be described in more detail later.This apparatus is utilized to carry out the present method of forming adouble weavers knot in the following sequence of operative steps.

Figure 4 shows the first step wherein the creel thread D is fed from thepreceding knot E along one side of the retaining pin 14 towards therotatable hook 16 while the shuttle thread G is held on the other sideof the retaining pin 14 by the shuttle 18. The shuttle thread G extendsfrom the preceding knot F of the row of meshes. (See Figure 4.)

Referring to Figure 5, the creel thread D is then looped in two fullloops about the retainer pin 14 and the rotatable hook 16 by means ofthe twine tube 20.

Referring to Figure 6 the looped creel thread D is then twisted overbetween the retainer pin 14 and the hook 16 by rotating the hook 16about 180 degrees and at the same time the twine tube 20 carries thefeeding end of the creel thread D diagonally across the twisted loops toa position at one side of the hook 16.

Referring to Figure 7, the shuttle 18 then passes up through the crossedover loops of the creel thread D so as to carry the shuttle thread Gthrough and above the loops.

Referring to Figure 8, while the shuttle 18 is in the top position shownin Figure 7, the twine tube 20 moves across to the other side of thehook 16 and the shuttle 18 then descends back down through the loops ofthe creel thread D.

Referring to Figure 9, the hook 16 then rotates back to its normalposition, about 180 degrees, so that the shuttle thread G is loopedabout the top strand of the creel thread D and due to the untwisting ofthe loop by the counter rotation of the hook 16 also passes behind thetwo outside strands of the creel thread D forming the loops.

With reference to Figure 10, tension is then applied by the bascule 24to the end of the creel thread D feeding through the twine tube 20 sothat the loops of the creel thread are tightened and at the same timethe restraining pin 12 has descended directly in front of the hook 16 sothat the loops of the creel thread D are slipped from the book 16 ontothe restraining pin 12. As the creel thread D continues to be drawn upthe restraining pin 12 moves towards the retaining pin 14 as is shown inFigure 11. When the knot has been tightened sufiiciently so that theloops and the restraining pin; 12 have almost reached the retaining pin14 the restraining pin 12 is raised allowing the loops to be tightenedfurther about the retaining pin 14. Finally, the retaining pin 14 iswithdrawn allowing the completed-knot to be tightened as is shown inFigure 13. As will be appreciated, the condition of the knot when itreaches the step shown in Figure 12 will be approximately the same asthat shown in Figure 13 the loops being shown as open in the presentillustrations to show the construction of the knot more clearly.

As this step by step sequence has been taking place all along the lengthof the loom, the completed knots are withdrawn in the usual manner clearof the retaining,

double loop having two bights and placing the leading.

end of said first thread across the twisted double loops, passing asecond thread through one bight of the twisted double loops, bringingsaid leading end of the first thread back across the leading end of thesecond thread and then passing the leading end of the second thread downthrough said bight of the twisted loop, untwisting said loop, thenapplying tension to said first thread to draw 2 the loops formed by saidfirst thread to form with said second thread a knot uniting said firstand second threads. 2

2. In a netting loom having a loom frame and rows of,

movable thread retaining pins and rotatable hooks mounted in spacedapart opposed parallel alignment on said frame, movable threadsupporting and conveying means adapted to convey single threads abouteach opposed pair of said spaced apart movable pins and rotatable hooks,a plurality of thread carrying shuttles mounted in spaced apartrelationship for reciprocal movement between said opposed rows of pinsand hooks, said pins, hooks, thread supporting and conveying means, andshuttles being adapted to move in time related sequence to uniteindividual threads by knotting therebetween, an

-' elongated bar mounted for reciprocal movement in timerelated sequencewith the movements of said retaining pins on said frame above and inparallel alignment with said retaining pins and hooks and carrying aplurality} of downwardly extending restraining pins disposed inspaced-apart alignment corresponding to said retaining pins, wherebysaid restraining pins are adapted to be interposed between saidretaining pins and hooks and moved in from a first position adjacentsaid hooks to a second position adjacent said retaining pins during theknot forming action of said loom.

3. In a netting loom as claimed in claim 2 wherein.

there is provided thread tensioning means adapted to cooperate with saidrestraining pins.

4. A method of forming a double weavers knot comprising, forming adouble loop of a first thread and retaining apart the ends of the loopsat two points of retention, twisting the loop to form a twisted doubleloop having two bights, moving the first thread diagonally to one sideof one of said points of retention, passing the second thread throughthe one bight of saidtwisted double loop adjacent the said one point ofretention, moving the first thread to the other side of said one pointof retention, passing the second thread back through the same bight ofthe loop, untwisting the loop and pro-' gressively restrainingthe loopwhile tightening the first thread, and then releasing the loops fromretention and 1 tightening the knot. I

5. A method of forming a'double weavers knot according to claim 4 inwhich the loop at said one point of retention is rotated about degreesto produce said twisted double loop with two bights. I

References Cited in the file of this patent UNITED STATES PATENTS YoungNov. -10, 1891

